Update type annotations and doctring

Author: phisanti

monai/networks/blocks/downsample.py

@@ -249,7 +249,7 @@ def __init__(
         """
         Downsamples data by rearranging spatial information into channel space.
         This reduces spatial dimensions while increasing channel depth.
-        
+
         Args:
             spatial_dims: number of spatial dimensions of the input image.
             in_channels: number of channels of the input image.

monai/networks/nets/restormer.py

@@ -113,7 +113,7 @@ def __init__(
         num_refinement_blocks: int = 4,
         ffn_expansion_factor: float = 2.66,
         bias: bool = False,
-        layer_norm_use_bias: str = True,
+        layer_norm_use_bias: bool = True,
         dual_pixel_task: bool = False,
         flash_attention: bool = False,
     ) -> None: